( Reaffirmed 2002 ) :I8 : 4511( Par.t 1 ) - 1986 Indian Standard METHODS STYRENE-BUTADIENE PART 1 DETERMINATION OF TEST FOR RUBBER ( SBR ) LATICES OF DRY POLYMER CONTENT SBRL : 1 ( Rubber Chairman Sam LALIT MOEAN JAMNADAS Vice-Chairman SHRI S. B. GANQULY Members SHRI K. S. LO~ANATHAN ( Alternate to Shri S. B. Ganguly ) Padinjarekara Agencies Ltd, Kottayam SHRI SATISH AERAHAY Transasia Carpets Ltd, Sikandrabad SF~RT 0. P. A~ARWAL SHRI J. N. JHA ( Alternate ) Ministry of Defence ( DGI ) SERI A. K. BANDOPADHAYA SHRI V. BRATTACHARYA ( Aitcrnatc ) Carbon and Chemicals India Ltd, Cochin DR B. BANERJEE Escon Consultants Pvt Ltd, Calcutta DR D. BANZRJEE Alkali and Chemical Corporation of India Ltd, DR P. S. BHABGAVA -Calcutta SHRI N. C. S~MAJDAR ( Alternate ) Andrew Yule & Co Ltd, Calcutta SHRI J. CHATTE~JFE SHRI-A. K. BISWAS ( Alternate ) All India Rubber Industries Association, Bombay SHRI P. K. CHATTERJEE DR S. N. CHARHAVARTY ( Alternate ) Synthetics and Chemicals Ltd, Bombay SHRI H. C. CHOPRA DR R. N. MEEROTRA ( Alternate I Association of Planters of Kerala, Cochin ' SHRI D. W. MCCRIRICK SHXI P. K. MENON ( Alternate ) National Test House, Calcutta DR D. K. DAS SHRI A. GHOSH ( Alternate ) Bata India Ltd, Calcutta SHRI P. B. G. DASTIDA~ SHRI S. SARI~AR ( Alternate ) Ministry of Defence ( R Br D ) SERI S. L. GANDHI SHRI H.-C. PERTI ( Alternate) ( Continued on page 2 ) Dunlop India Ltd, Calcutta First Revision ) Sectional Committee, PCDC ting Works Pvt Ltd, Bombay 14 R~jrew Cosmos India Rubber I INDIAN STANDARDS @ CoPlyright 1986 INSTITUTION This publication is protected under the In&n Copyr:ght Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. IS : 4511 ( Part 1 ) - 1986 ( Conlinuedfrom pug.4 1) Members SHRI J. M. GARB Representing Directorate General of Technical Development, New Delhi SEW A. GEORGE JOHN MRF Ltd, Madras Plantation Corporation of Kerala Ltd, Kottayam SHRIK. J. JOSEPH SHRI K. T. VERUEESE ( Alternate ) Indian Rubber Regenerating Co Ltd, Thane SHRI G. R. KAVISHVAR SHRI P. S. V~RANI ( Alternate ) M. M. Rubber Co Ltd, Madras SHRI K. N. KOSHY SHRI N. SUBRAMANIAN ( Alternate ) Thirumbadi Rubber Ltd, Mokkam Snrzr P. K. _MADHAVA MENON SHRI M. PUSHKARAKSHAN ( Alternate ) Modi Rubber Ltd, Modipuram SHRI L. K. MATHUR Unit~oo~~;ters' Association of Southern India, SHRI P. K. MENON SHRI E. B. UNNI ( dlternate ) DR W. MILLNS SRRI N. B. FE~ATJE( dlternate ) Hindustan Latex Ltd, Trivandrum SHRI R. MURLEEDHARAN NAIR Bayer ( India ) Ltd, Bombay SHRI R. R. PAND~T SHRI D. J. BIXARUCHA ( Alternate ) London Rubber Co ( India ) Ltd, Madras SEW S. A. PASHA SERI R. KRISHNAN ( Alternate ) Arakkunnam Cooperative Rubber Marketing SHRI M. C. PAUL Society Ltd, Arakkunnam Automotive Tyre Manufacturers' Association, SHRI A. RAJAYANI New Delhi SHRI A. GEORQE JOHN ( Alternate ) Tyre Corporation of India Ltd, Calcutta DR S. K. RAY SHRI S. B. SAREAR ( Alternate ) Travancore Rubber & Tea Co Ltd, Trivandrum SHRI S. v. S.%RNA SHRI C. S. KRXSHXASWA~~Y( Aht8i;fn) Ltd, Petrochemicals Corporation SARI SUNIL I. SHAH Tawaharnanar SHRI A. K. MALLIK ( Alternate ) State Trading Corporation of India Ltd, Bombay SRRI RAJ~NDER SINQH SHRI 0. P. ARORA ( Alternute ) Rubber Research Institute of India, Kottayam; and DR E. V. THOMAS Rubber Board. Kottavam DR M. G. KUXARAN ( Alternate I ) DR N. M. MATHEW ( Alternate II ) Director General, ISI ( Ex-@`icio Member ) SHRI M. S. SAXENA, Director ( P & C ) Secretary SHRI DILEEP KUMAR Assistant Director ( P & C ), ISf Indian Rubber Thane Manufacturers' Research Association, ( Continued on page 10 ) 2 IS : 4511 ( Part 1 ) - 1986 Indian Standard METHODS STYRENE--BUTADIENE PART I DETERMINATION OF TEST FOR RUBBER OF DRY ( SBR ) LATICES CONTENT POLYMER SBRL : 1 ( First Revision ) 0. FOREWORD 0.1 This Indian Standard ( Part 1 ) ( First Revision ) was adopted by the Indian Standards Institution on 14 February 1986, after the draft finalized by the Rubber Sectional Committee had been approved by the Petroleum, Coal and Related Products Division Council. 0.2 Test methods for rubber latex had been originally covered in the following Indian Standards: For natural rubber latex IS IS IS : 3708 ( Part 1 )-1966* : 3708 ( Part 2 )-1968t rubber latex For styrene-butadiene : 4511 ( Part 1 )-1967$ Since some of the test methods covered in these standards were common, the concerned committee had decided to unify and publish a separate series of methods of test which would be applicable to all types of Iatices natural as well as synthetic. Accordingly, the following six test methods had been covered in the following different parts of IS : 9316: IS : 9316 Methods of test for rubber latex: Part l-1979 Determination of surface tension *Methods of test for natural rubber latex: Part 1 Dry rubber content, sludge content, density, total alkalinity, KOH-number? mechanical stability, volatile fatty acid number, pH, total nitrogen, total copper, total won, total maganesr and total ash. tMethods of test for natural rubber latex: Part 2 Determination of boric acid and magnesium. SMethods of tests for styrene-butadiene rubber ( SBR ) laticer: Part 1 Determination of dry polymer, pH, density, residual styrene, bound styrene and soap content. 3 IS : 4511 (Part Part Part Part Part Part 1 ) - 1986 Determination Determination Determination Drawing Determination of viscosity of coagulum content of total solids content of #H 2- 1979 3-1979 4-1979 5-1979 6-1982 of samples 0.2.1 As a result of further rethinking on the subject, it has now been decided to re-designate the test methods common to natural and synthetic rubber latices as RL series; test methods for natural rubber latex as NRL series and test methods for styrene-butadiene rubber latex as SBRL series. Consequently, test methods for rubber latex have been rationalized into the following three series: a) IS : 9316 Unified methods and synthetic rubber latices b) IS : 3708 Methods NRL series; and c) 0.3 The of test of test applicable - RL series; applicable to natural to both rubber natural latex - IS : 4511 Methods of test applicable latex - SBRL series. to styrene-butadiene rubber (Part existing Indian Standards IS : 3708 ( Part 1 )-1966*, IS : 3708 2 )-1968t, IS : 4511 (Part 1 ):1967$, IS: 9316 (Parts 1 to 5)-19799 and IS : 9316 ( Part 6 )-I98211 are being gradually replaced by separate three series, designated as NRL, SBRL, or standards under the above RL series, respectively. 0.5.1 The methods covered under NRL : 13, NRL : 14 and NRL : 15 of IS : 3708 ( Part 1 )-1966* which are also under revision, have been proposed to be covered under the RL series in IS : 9316 ( under revision ). 0.4 In in the series ( Part order to facilitate cross-reference, it has been decided to retain, revisions of various parts of IS : 4511, the original discrete SBRL numbers assigned to various test methods earlier in IS : 4511 1 )-1967:. *Methods of test for natural rubber latex: Part 1 Dry rubber content, sludge content, density, total alkalinity, KOH-number, mechanical stability. volatile fatty acid number. @, t&al nitrogen, total copper, total iron, total manganese &d total ash: ?Methods of test for natural rubber latex: Part 2 Determination of boric acid and magnesium. $Methods of,tests for styrene-butadiene rubber ( SBR ) latices: Part 1 Determination of dry polymer, pH, density, residual styrene, bound styrene and soap content. &Methods of test for rubber latex: S Part 1 Determination of surface tension. Part 2 Determination of viscosity. Part 3 Determination of coagulum content. Part 4 Determination of total solids content. Part 5 Drawing of samples. [IMethods of test for rubber latex: Part 6 Determination of pH. 4 IS : 4511 ( Part 1 ) - 1986 0.4.1 For proper referencing of the existing test methods and the new methods under revision, a statement showing corresponding methods is given in Appendix A. 0.5 In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS : 2-1960". 1. SCOPE 1.1 This standard ( Part 1 ) prescribes the procedure for determination of dry polymer content of styrene-batadiene rubber latices. 2. OUTLINE OF THE METHOD The coagulum is refluxed, 2.1 Latex is coagulated by isopropanol. washed, dried and weighed. 3. APPARATUS 3.1 Air Oven 3.2 Desiccator 3.3 Flask - 250-ml or 500-ml capacity least 50 mm diameter. 3.4 Measuring Cylinder 3.5 Nylon Gauze 3.7 Steam Bath 3.8 Watch Glass 3.9 Weighing 4. REAGENT 4.1 isoPropano1 5. PROCEDURE conforming 105 microns. maintained at 105 f 2°C. with ground glass neck of at 1OO-ml capacity. 3.6 Reflux Condenser - all glass with ground glass joints. Bottle with Close Fitting Stopper to IS : 2631-1976t. 5.1 Take the seived original latex in dry prepared ( at 105 f 2°C ) weighing bottle and transfer 5 to 7 g of latex by difference of mass, to the nearest 1 mg, in a small beaker ( 100 ml ) and dilute it to *Rules for-rounding off numerical values ! revised ). tspecification for~isopropyl alcohol ( /irst revision ). 5 IS : 4511(Partl)-1986 approximately 25 to 30 percent with distilled water. Pour the diluted latex in thin stream into a flask ( 500 ml ) containing 100 ml of isopropanol. Rinse the beaker with distilled water and transfer to the flask. Attach the reflux condenser to the flask and reflux on the steam bath for one hour. Remove the flask from the steam bath and decant the solvent into a beaker covered with fine gauze, taking care that the minimum amount of coagulum is decanted with the solvent. Return any coagulum from the gauze to the flask, -add 100 ml of distilled water to the flask and shake vigorously. Decant the water through the same gauze and repeat the procedure with 100 ml of fresh water until no more foam is obtained ( three or four washings may be sufficient ). Wash the decanted coagulum in the flask with 100 ml solvent and the coagulum into the gauze. Carefully transfer the coagulum to pretared watch glass and dry at 105 * 2°C in the air oven. Cool in a desiccator to room temperature and weigh. Repeat drying and weighing till the dried mass is constant to 0'000 2 g. 5.2 If duplicate determinations do not agree within 0'2 percent "dry polymer, make additional duplicate determinations until such agreement is obtained. 6. CALCULATION 6.1 Calculate the dry rubber content as follows: Ml -MZ Dry polymer content, percent by mass = where Ml = mass in g of dried coagulum, and 2112 = mass in g of the original latex. x 100 APPENDIX ( Clause 0.4.1 ) A TABLE SHOWING CORRESPONDENCE OF VARIOUS METHODS OF TEST COVERED IN THE EXISTING IS : 9316 ( PARTS 1 TO 5 )-1979, IS : 9316 ( PART 6 )-1982, IS : 3708 ( PART 1 )-1966, IS : 3708 ( PART 2 )1968, IS : 4511 ( PART 1 )-1967, WITH THE REVISION/PROPOSED REVISION OF IS : 9316, IS : 3708 AND IS : 4511 rEXISTING TEST METHODS ~~~--~_~_h____~~~~~~~~ Part ( Series ) IS No. Test Method (1) RL SiZRIES r;E Determination of surface tension Determination of viscosity of Determination coagulum content Determination of total solids content Drawing of samples Determination of PH Determination of total Dez!%iation iron Determination manganese of total of total IS : 9316-I 959 IS : 93 16-1979 IS i 9316-1979 IS : 9316- 1979 IS : 9316-1979 IS : 9316-1582 IS : 3708-1966 IS : 3708- 1966 IS : 3708- 1966 Part 1 Part 2 Part 3 Part 4 Part 5 Paft 6 Part 1 ( NRL : 13 ) Part 1 ( NRL : 14 ) Part 1 ( NRL : 15 ) IS:9316 IS:9316 IS : 9316 IS: 9316 IS : 9316 IS : 9316 IS:9316 IS : 9316 IS : 93 16 PArt 1 (RL: Part2(RL:2) l)] 1 (2) (3) PROPOSED REVISION ~_____h____-_~ Part ( Series ) IS No. (4) (5) REMARKS (6) Part 3 ( RL : 3 ) f I Part 4 (RL:4) 1 \i Part 5 (JCL : 5 1 i Part 6 (RL : 6) , Part7(RL:7) 1 I G1 Under revision i 5 h q Part 8 ( RL : 8 ) i I Part 9 ( RL : 9 ) 1 I ' ( Continued ) 9 L Y I r g TABLE SHOWiNG CORRESPONDENCE OF VARIOUS METHODS OF TEST COVERED IN `I'HE EXISTING iS : 9316 ( PARTS 1 TO 5 )-1979, IS : 9316 ( PART 6 )-1982, IS : 3708 ( PART 1 )-1966, IS : 3708 ( PART 2 )1968, IS : 4511 ( PART 1 )-1967, WITH THE REVISION/PROPOSED REVISION OF IS : 9316, IS : 3708 AND IS : 4511 Contd c----------Test Method (1) EXISTING TEST METHODS h-------_-___~ IS No. (2) dry IS : 3708-1966 IS : 3708-1966 IS : 3708-1966 IS : 3708- 1966 IS : 3708-1966 IS : 3708-1966 IS : 3708-1966 IS : 3708-1966 IS : 3708-1966 Part Part Part Part Part Part Part Part Part Part ( Series (3) 1 ( NRL 1 ( NRL ) PROPOSED REVISION ~_~_~~-A--~~__~~ IS No. (4) IS : 3708-I 985 IS : 3708-1985 IS : 3708-1985 IS : 3708-1985 IS : 3708-1985 IS : 3708-1985 IS: 3708-1985 Part Part ( Series ) (5) 1 ( NRL (6) s t; 0.' f w L h REMARKS 7 r( cc clr ; NRL SERIES : 1) :5 ) :6 ) :7 ) :8 ) : 9 ) 10) z : 1) :5) :6) Determination of rubber content Determination content Determination density Determination alkalinity Determination number Determination mechanical of sludge o of total of KOHof stability Part 2 ( NRL Part 3 ( NRL Q, 1 ( NRL 1 ( NRL 1 ( NRL 1 ( NRL 1 (NRL: 1 ( NRL Part 4 ( NRT. : 7 ) Part 5 ( NRL :8 ) :9 ) Part 6 ( NRL Part 7 (NRL Part 8 ( NRL Part 9 ( NRL Determination of volatile fatty acid number Determination nitrogen Determination ash of total of total : 10) : 12 ) : 16) : 12 ) : 16 ) IS : 3703-1985 IS : 3708-1985 1 ( NRL Determination acid Determination nesium SBRL SERIES Determination polymer Determination density of boric of mag- IS : 3708-1968 IS : 3708-1968 Part 2 ( NRL : 17 ) Part 2 ( NRL : 18 ) IS : 3708 IS : 3708 Part Part 10 (NRL 11 ( NRL : 17) : 18 ) of of dry IS : 4511-I 967 IS: 451 -1967 IS : 451 -1967 Part Part Part 1 ( SBRL : 1 ) 1 (SBRL: 6) IS : 4511 IS : 4511 IS : 4511 Part 1 ( SBRL : 1 ) Part 2 ( SBRL : 6 ) Part 3 ( SBRL : 8 ) Under Revision iD Determination of residual styrene ( irolatile unsaturates ) Determination of bound styrene Determination of soap content 1 ( SBRL : 8) IS : 451 -1967 IS : 4511-1967 Part Part 1 (SBRL: 9) IS:4511 IS : 4511 Part4(SBRL:9) Part 5 ( SBRL : 10 ) Under Revision 1 ( SBRL : 10) IS : 4511 ( Part 1 ) - 1986 ( Continued from page 2 ) Methods of Testing Subcommittee, Convener DR S. N. CHAKRAVARTY Members SHRI S. K. MUSTAFI ( Alternale Dr S. N. Chakravarty ) SHRI SATISH ABRAHAM SHRI P. S. BALASUBRAMANIAM SHRI S. KUMAR ( Alternate ) SHRI A. N. BHATTACHARYA to Modi Rubber PCDC 14 : 1 Representing Ltd, Modipuram Padinjarekara Agencies Ltd, Kottayam L. G. Balakrishnan & Bros Ltd, Coimbatore Union Commercial Calcutta & Industrial Co Pvt Ltd, SHRI B. PANJA ( Alternate ) SHRI J. CHATTERJEE Andrew Yule & Co Ltd, Calcutta SHRI A. K. BISWAS I Alternate ) SHRI P. K. CHATTERJEE` . Bayer ( India ) Ltd, Bombay SHRI D. J. BHARUCHA ( Afternate ) Synthetics & Chemicals Ltd, Bombay SERI H. C. CHOPRA DR R. N. MEHROTRA ( Altemnte ) Direc$rrt~e$meral of Technical Development, SHRI J. M. GARQ e Ministry of Defence ( DGI ) SHRI K. R. GARQ SHRI P. L. NAQ ( Alternofe ) Polyolefins Industries Ltd, Bombay Sam C. S. INAMD.~R SHRI V. K. SUD ( Alternate ) MRF Ltd, Madras SHRI A. GEOKQE JOHN Indian Rubber Regenerating CQ Ltd, Bombay SHRI G. R. KAVIS~VAR SHRI P. S. VIRANI ( Altcmate ) Cosmos India Rubber Works Pvt Ltd, Bombay SHRI P. L. KINARIWALA SHRI S. N. GHADQE ( Alternate ) Dunlop India Ltd, Calcutta SBRI g. S. LOQANATHAN DR S. CHATTOPADHYAY ( Alternate ) Ttgir;badi Rubber Co Ltd, Mokkam SHRI P. K. MADHAVA MENON Petrochemicals Corporation Ltd, Sanr A. K. MALLIE Jawaharnagar DR Y. N. SHARMA ( Ahmute ) Indian Rubber Manufacturers' Research Association, DR W. MILLNS Thane Tyre Corporation of India Ltd, Calcutta SHRI Asox MITRA DR S. K. RAY ( Alternate ) National Test House, Calcutta SERI P. K. PAIN Travancore Rubber & Tea Co Ltd, Trivandrum SHRI S. V. SARMA SHRI C. S. KRISHNASWAMY ( Alternate ) Rubber Board, Kottayam SHRI E. V. THOMAS DR N. M. MATHEW ( Althate ) 10